Greater flexibility now comes in a smallerpackage — Cutler-Hammer’s “Narrow Design”Type VCPW-ND. Reliable, maintenance-freevacuum circuit breaker technology designed into a “space saving” 26" wide switchgearsection.

The Cutler-Hammer Type VCPW-ND VacuumCircuit Breaker was specifically designed tomeet and exceed ANSI, IEEE, NEMA, and IECStandards. Local codes can also be met with anexclusive VCPW-ND UL Listed option for breakersand switchgear. There is no longer a need to belocked into the industry standard, 36" wideswitchgear. This new space saving, 26" widedesign solves the problem of limited floor space.

A Variety of Applications

With its small footprint and the flexibility of aone or two-high design, the Type VCPW-NDVacuum Circuit Breaker is an ideal solution forapplications where space comes at a premium:

• Generator control• Oil platforms• Add-ons to existing switchgear • Outdoor switchgear

Quality and Reliability are Built-In

All Type VCPW-ND circuit breakers aredesigned for reliability and minimal maintenance… a direct result of engineering with provencomponents, quality materials and fewer movingparts.

Each Type VCPW-ND Vacuum Circuit Breakeris assembled in an lSO 9002 certified facilityand provided with its unique Quality AssuranceCertificate that documents all tests and inspectionsperformed.

Cutler-Hammer is a world leader in vacuuminterrupters and vacuum circuit breakers. TheType VCPW-ND Vacuum Circuit Breakerincorporates many design features which havebeen field proven through more than 30 years ofvacuum interrupter design and manufacturingexperience… coupled with over 75 years ofpower circuit breaker design and manufacturingexperience.

MED

IUM

VOL

TAGE

VAC

UUM

CIRC

UIT

BREA

KERS Type VCPW-ND, NARROW DESIGN MEDIUM

VOLTAGE VACUUM CIRCUIT BREAKERSANSI 5 kV at 250 MVA1200 Amperes, 60 kV BIL

IEC 3.6 - 7.2 kV at 25 kA and 31.5 kA630 and 1250 Amperes, 60 kV BIL

For more information visit: www.cutler-hammer.eaton.com

July2003

Maintenance Free Vacuum Technology

Spiral copper-chrome contacts provide superiorperformance characteristics, including lower chopcurrents. The spiral contact design provides a self-induced magnetic effect that moves the arc rootaround the contact periphery. This very efficient arccontrol prevents hot spots which minimizes contacterosion.

The Industry’s Best Systemfor an Electrical Connectionto a Vacuum Interrupter

Our nonsliding current transfer system consists of aseries of tin-plated, high-conductivity copper leafconductors that are swaged onto the vacuum stems:

• Providing improved current flow through theincreased surface area (skin effect) of the multipleconductors while the multi-point contacts offer verylow electrical and thermal resistance.

• Unlike sliding or rolling designs, there are no movingparts to wearout … therefore, no maintenance.

• Resulting in longer circuit breaker life.

Plus, our unique, patented V-Flex system allows forvacuum stem movement thus creating less frictionand wear with fewer moving parts and a shorterstroke. This provides for a simpler, more compact,low energy mechanism with longer life and greaterreliability.

Designed-ln Safety Features Provide OptimumOperator Safety

• Double dead front shields isolate the operatorfrom high voltage when the breaker is energized.Additionally, the circuit breaker can beconnected or disconnected with thecompartment door closed by utilizing anelectric levering device or a manually operatedlevering device.

• True mechanically and electricall trip-free storedenergy mechanism design means that whileholding a mechanical trip command, the breakercontacts will not close or touch even if anelectrical or mechanical close command isreceived .

• Safety interlocks provide added operator safety.The mechanism is held mechanically trip-freewhen levering the circuit breaker in or out.Additionally, closing springs will dischargeautomatically when the breaker is beingwithdrawn from or inserted into its compartment.

PatentedV-FlexDesign

Primary Contacts(finger clusters)

Vacuum Interrupter

ContactSegments

InterrupterStem

Copper LeafConductors

Arc

CurrentPath

DrivingForceon theColumnarArc

Controls and indicators are functionally grouped on the front panel of the VCPW-NDbreaker for user friendly operation.

For more information visit: www.cutler-hammer.eaton.com

July2003

Designed for Easy Access, Inspection, andMinimal Maintenance

Removing the circuit breaker front panelprovides access to the stored energymechanism and control components, facilitatingease of inspection. Minor maintenance whenrequired, such as lubricating the mechanism andaccessing the control components, is simplified.

When the circuit breaker is withdrawn from thecompartment on removable extension rails, thecontact erosion indicator (one for each vacuuminterrupter) can be visually inspected. Onlyoccasional visual inspection is required.

7.00(177.8)

7.00(177.8)

21.38(543.1)

30.38(771.6)

29.19(741.4)

12.00(304.8)

13.625(346.1)

7.73(196.3)

22.65(575.3)

21.96(557.8)

0.5(12.7)

Type VCPW-ND Dimensions - Inches (mm)

Front View Side View

ContactErosionIndicator

Circuit Nominal Nominal Voltage Insulation Level Current Inter- Permis- Maximum Current ValuesBreaker Voltage 3-Phase Maximum Voltage Withstand Contin- Short rupting sible Voltage Maximum Closing ClosingType Class MVA Voltage Range Test Voltage uous Circuit Time Tripping Divided Symmetrical and and

Class Factor Current Current Delay By K Interrupting Latching Latchingat 60 Hz (at Rated Capability Capability Capability

Max. kV) Momentary

Power Impulse K Times 2.7 K 1.6 KFre- Rated Short Times Times quency Circuit Rated Rated

2 (1 min.) 3 Current24 Short ShortCircuit CircuitCurrent Current

E K I Y E/KkV MVA kV rms kV rms kV Peak Amperes kA rms Cycles Seconds kV rms kA rms kA Peak kA rms . . lbs.

50VCPW-ND250 4.16 250 4.76 1.24 19 60 1200 29 5 2 3.85 36 97 58 345

ANSI Standards – VCP-W Vacuum Circuit Breaker Types Rated on Symmetrical Current Rating Basis 1Identification Rated Values Weight

Circuit Voltage Insulation Level Normal Short 3 Second Short CableBreaker Class Power Impulse Current Circuit Short Time Circuit ChargingType Frequency Withstand Breaking Current Making Breaking

Current Current AmpskV rms kV Peak kV Peak Amperes kA rms kA rms kA Peak Amperes.. kg

36VCPW-ND25 3.6 10 40 630, 1250 25. 25. 63 25 159

36VCPW-ND32 3.6 10 40 630, 1250 31.5 31.5 79 25 159

72VCPW-ND25 7.2 20 60 630, 1250 25. 25. 63 25 159

72VCPW-ND32 7.2 20 60 630, 1250 31.5 31.5 79 25 159

IEC Standards – VCP-W Vacuum Circuit Breaker Types Rated on Symmetrical Current Rating Basis 5Identification Rated Values Weight

1 Applicable ANSI Standards C37.04-1979, C37.09-1979, and C37.06-1987.Operating Duty Cycle CO-15 seconds-CO. Operating Time Values:Opening 30-45 ms, Closing 45-60 ms and reclosing 18 cycles (300 ms).

2 Consult Application Data 32-265 for further information.

3 Optional interrupting time of 3 cycles is available.4 Also 3-second short time current carrying capability.5 Interrupting time is 3 cycles at 50/60 Hz.

Rated operating sequence O-3 min-CO-3 min-CO, in accordance with IEC-56.

Underwriters Laboratories, Inc. listed option is available.UL®

Eaton CorporationCutler-Hammer business unit1000 Cherrington Parkway Moon Township, PA 15108United Statestel: 1-800-525-2000www.cutler-hammer.com

© 2003 Eaton CorporationAll Rights ReservedPrinted in USAForm No. PA 01301003ESeptember 2003

All circuit breakers and related switchgear shall conformto applicable [ANSI, IEEE, UL Listed] or [lEC] 1standards. All circuit breakers shall use vacuuminterrupter technology, be manufactured in a Cutler-Hammer ISO 9002 factory, and be Cutler-Hammer TypeVCPW-ND, rated as follows:

Maximum Voltage:ANSI 4.76 kIEC 3.6 - 7.2 kV

Insulation Level:Power Frequency - 19 kV rmsImpulse Withstand - 60 kV peak

Short Circuit Current:ANSI - 29 kA (250MVA) 1IEC - [25 kA] or [31.5 kA] 1

Close and Latch Capability:ANSI - 97 kA peak1

Short Circuit, Making Current:IEC - [63 kA] or [79 kA] peak 1

Interrupting Time:[Five] or [Three] cycles 1

Continuous Current:ANSI - [1200A] 1IEC - [630A] or [1250A] 1

The vacuum circuit breakers shall be horizontal drawout typecapable of being withdrawn on rails. The circuit breakersshall be operated by a motorcharged spring type storedenergy mechanism, charged normally by an electric motorand in an emergency by a manual charging tool. The primarydisconnecting contacts shall be self-aligning, silverplatedcopper. Each circuit breaker shall be of modular construction,containing front accessible mechanism with free andunobstructed access to control components for ease ofinspection or maintenance. Each circuit breaker shall containthree vacuum interrupters separately mounted in a self-contained, self-aligning pole unit, which can be removed ascomplete assemblies. The vacuum interrupter pole unitprimary phase to ground insulation system shall be glasspolyester. A contact erosion indicator for each vacuuminterrupter, which requires no special tools to indicateavailable contact life, shall be easily visible when the breaker

is removed from its compartment. The vacuum interruptershall utilize copper chrome contact material. The currenttransfer from the vacuum interrupter moving stem to thebreaker main conductor shall be a nonsliding/nonrolling design.The secondary contacts shall be silver-plated and shallautomatically engage the breaker in the operatingposition, and also manually engage in test position.

Each circuit breaker compartment cell shall be equipped tohouse a removable breaker element. The levering deviceshall allow for the circuit breaker to be connected ordisconnected with the door closed by use of a manuallevering tool or optionally by an electrical leveringmechanism. It will include all of the necessary interlocks torender the breaker mechanism mechanically and electricallytrip free during the levering process. Extension rails shall beprovided to allow withdrawal of the circuit breaker forinspection and maintenance without the need for liftingdevices or portable platforms.

The stationary primary contacts shall be silver-plated and recessed within glass polyester insulating tubes.A grounded steel shutter shall automatically cover thestationary primary disconnecting contacts when the circuitbreaker is in the test or disconnected position or out of thecell. Positive guidance rails shall be provided to automaticallyalign the primary and secondary disconnects while insertingthe circuit breaker into the switchgear.

All main bus supports between sections shall be [glasspolyester] or [porcelain]1. All auxiliary compartments forpotential transformers, control power transformers, and/orfuse drawers shall conform to a drawout 26" wide switchgearconstruction. Main bus supports, cable supports, and allstandoff insulators shall be [glass polyester] or [porcelain]1.

The switchgear assembly shall consist of individual verticalsections housing various combinations of circuit breakersand auxiliaries, bolted to form a rigid metal-clad 26" wideswitchgear assembly.

1 Note to Specification Writer: Select one of the availablestandards or ratings.

Typical Specification forWestinghouse Type VCPW-ND Medium Voltage Vacuum Circuit Breakersand Related Metal-Clad Switchgear